Hinged double telescope.



R. STRAUBEL.

HINGED DOUBLE TELESCOPE.

APPLICATION FILED MAY 12, 1908.

962,929. Patented June 28,1910.

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UNITED STATES PATENT QFFICE.

RUDOLF STRAUBEL, OF JENA, GERMANY, ASSIGNOR TO THE FIRM OF CARL ZEISS,OF JENA, GERMANY.

HINGED DOUBLE TELESCOPE.

To all whom it may concern:

Be it known that I, RUDoLr STRAUBEL, a citizen of the German Empire, andresiding at Oarl-Zeiss strasse, Jena, in the Grand Duchy of SaxeJVeimar,Germany, have invented a new and useful Hinged Double Telescope, ofwhich the following is a specification.

The invention consists in a hinged double telescope, the hingeconstruction of which facilitates remarkably the production ofparallelism between the optical axes of the two telescopes and the hingeaxis. With this hinge construction, in neither telescope the hingejournal or bearing surface or surfaces need to be located relatively tothe hinge arm or arms, before the optical parts have been fixed in thetelescope casing and thus the position of the optical axis of thetelescope relatively to the casing has been determined, so that suchlocation can be reali'zed in accordance with the direction of theoptical axis. In this way neither a loosable connection between thecasing of each telescope and its hinge arm or arms nor shifting any ofits optical parts is required for producing the parallelism of the threeaxes.

The essential features of the new hinged double telescope is, that theannular hinge abutment surfaces are spherical with a common center inthe hinge axis. It will be understood, that a pair of hinge abutmentsurfaces means two surfaces by which a hinge arm of one telescope and ahinge arm of the other telescope are in surface contact and whichsurround the hinge bolt and abut in one direction the relativedisplacement of the telescopes parallel to the axis of the hinge. heneach telescope has two hinge arms and when consequently two pairs ofhinge abutment surfaces exist, these two pairs are concentric to eachother and may lie either on the same side or on opposite sides of thecenter. In the latter case both pairs may have the same radius, 2'. 0.,be zones of the same sphere. Further such spherical abutment surfacesmay also be used in the ordinary case, that the arms of one telescopeembrace those of the other, as the said surfaces are small enough toallow of the spherical joint being closed and opened by a relativerotation of the telescopes about the center of the sphere in the medianplane of the double telescope. The annular sur- Specification of LettersPatent.

Application filed May 12, 1908.

Patented June 28, 1910.

Serial No. 432,392.

face on the opposite side of each hinge arm may be plane andperpendicular to the axis of the hinge or likewise spherical and in thiscase preferably concentric to the abutment surface of the same arm. Anarrangement of the latter kind with the two hinge arms of one telescopeembracing the hinge arms of the other telescope may be developed to forma hinge which is in such a way adjust-able that the parallelism of thethree axes can be restored, when the direction of one of the opticalaxes should have been altered by an accident. For this purpose a hingebearing is adjustably fitted to the inner spherical surfaces of theembraced arms and the hinge bolt to the outer spherical surfaces of theembracing arms.

In the accompanying drawing: Figure 1 is a sectional elevation of theseparate telescopes of a prism field glass constructed according to theinvention, the hinge arms still requiring to be bored. Fig. 2 is asectional elevation of one telescope of another prism field glassconstructed according to the invention. Fig. 3 is a sectional elevationof the hinge part of a complete field glass one telescope of which isshown in Fig. 2.

Referring to the example Fig. l of the two telescopes a and b, the one ais provided with the embracing and Z) with the embraced hinge arms. Bothtelescopes are fitted with the optical parts through which the directionof the optical axis (19 a in a and that of the optical axis 6 b in b aredetermined. There are further the spherical abutment surfaces a a and 66 having the diameter D, already worked, so that both telescopes can beunited to form a spherical joint and hereafter adjusted with the twoaxes a and 72 6 parallel to each other. After such junction andadjustment are made, the hinge surfaces. can be located. For thispurpose the bores in the hinge arms are worked, all four in oneoperation and so that their common axis 0 0, which becomes the axis ofthe hinge, is parallel to the two optical axes (4 64 and b b andincludes the common center of the abutment surfaces a a and b 6 Theother surfaces of the hinge arms, (land 6 on the telescope a and f and gon the telescope Z), now may be worked as plane annular surfacesperpendicular to the axis of the hinge, but in the drawing it has beensupposed that they are spherical and concentric to the abutmentsurfaces, together with which they may have been worked. To obtain acomplete field glass, a sleeve may be provided to connect the embracedhinge arms and a hinge bolt may be tightly fitted in the bores of thearms and secured to the embracing arms. 7

In the example Figs. 2 and 3 all surfaces can be worked before thetelescopes are fitted with the optical parts. The hinge arms h h and iz' are essentially shaped as in Fig. 1. Their bores not being used ashinge surfaces, have a comparatively great diameter. A special bearingsleeve 79 is fitted to the inner spherical surfaces of the embraced armsand adjustably secured to these arms by means of screws Z-having someplay in the arms. In a similar manner the hinge bolt m is connected withthe embracing arms by means of screws 71 which pass through its headfitted to the outer arm surface and through a ring 0 fitted on the boltat its opposite end and to the outer surface of the other arm.

The location of the hinge surfaces the journal or bolt surface in thetelescope p and the bearing surface in the telescope 9, may be performedas follows. After the separate telescopes arefitted with the opticalparts, in the telescope 9 shown in Fig. 2 the bearing sleeve 70 isadjusted to have its axis 1 7 parallel to the optical axis 9 Then thetwo telescopes are united and their spherical joint adjusted until theoptical axes of both telescopes are parallel to each other. Hereafterthe hinge bolt m is introduced into the bearing sleeve is and secured tothe embracing arms in the manner shown in Fig. 3. Whenever theparallelism of the three axes should get lost, the method just describedwill allow of restoring it.

I claim- 7 l. A hinged double telescope the two telescopes of which arerotatable about a common hinge axis by means of bored hinge arms withspherical hinge abutment surfaces, the hinge axis having a fixedposition relatively to each telescope and the abutment surfaces having acommon center in the said axis.

2. A hinged double telescope of the two telescopes of which each has twobored hinge arms, the arms of one telescope embracing with concavespherical hinge abutment surfaces the arms of the other telescopeprovided with corresponding convex abutment surfaces, these fourabutment surfaces be ing zones of the same sphere with the center in theaxis of the hinge.

3. A hinged double telescope of the two telescopes of which each has twobored hinge arms, the arms of one telescope embracing with concavespherical abutment surfaces the arms of the other telescope providedwith corresponding convex abutinent surfaces, these four abutmentsurfaces having a common center in the axis of the hinge, each armhaving on the opposite side another spherical surface concentric to itsabutment surface, the hinge bolt being fitted to the outer sphericalsurfaces of the embracing arms and adjustably secured to these arms anda bearing sleeve being fitted to the inner spherical surfaces of theembraced arms and adjustably secured to these arms.

RUDOLF STRAUBEL.

lVitnesses PAUL KRUGER, FRITZ SANDER.

